There is a volcano on Mars three times the size of Everest. At 600 km wide and 21 km high, Olympus Mons is a volcano on Mars that may still be active, according to scientists. It is the tallest peak of any planet. However, the Rheasilvia central peak on the asteroid Vesta is taller at 22 km.

The Sun comprises 99.86% of the solar system's mass, primarily three-quarters hydrogen with most of the rest helium. This yellow star is 330,000 times Earth's mass. Jupiter accounts for about two-thirds of the remaining mass.

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The Moon was once a piece of the Earth. The theory is that when Earth was a relatively young planet, it was struck by a giant object and this collision broke a piece of the Earth away to create the moon. This piece then began to orbit the Earth as a result of its gravitational pull.

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